Control method of energy storage apparatus, energy storage apparatus, and photovoltaic power generation system

Abstract

An energy storage apparatus, including a plurality of battery modules, a switch unit, a start unit; and an electrical energy output port. The energy storage apparatus is configured for use in a photovoltaic power generation system having a plurality of photovoltaic modules, a direct current-to-direct current (DC/DC) converter, and a direct current-to-alternating current (DC/AC) converter. The plurality of battery modules is separately connected to the start unit and the switch unit, and the plurality of battery modules are configured to, when the start unit receives a start signal, control the switch unit to be turned on. The energy storage apparatus is configured to, in response to the switch unit being turned on, output electrical energy of the plurality of battery modules through the electrical energy output port, and, in response to the switch unit being turned off, disconnect the plurality of battery modules from the electrical energy output port.

What is claimed is: 
     
         1 . An energy storage apparatus, comprising:
 a plurality of battery modules, each of the plurality of battery modules comprising a battery pack and an auxiliary power supply;   a switch unit;   a start unit; and   an electrical energy output port;   wherein each of the plurality of battery modules is separately connected to the start unit and separately directly connected to the switch unit, and wherein the plurality of battery modules are configured to, when the start unit receives a start signal, control the switch unit to be turned on;   wherein the switch unit is connected to the electrical energy output port; and   wherein the energy storage apparatus is configured to, in response to the switch unit being turned on, output electrical energy stored in the plurality of battery modules through the electrical energy output port, and wherein the energy storage apparatus is configured to, in response to the switch unit being turned off, disconnect the plurality of battery modules from the electrical energy output port.   
     
     
         2 . The apparatus according to  claim 1 , wherein each of the plurality of battery modules further comprises a first switch;
 wherein a first end of the auxiliary power supply is connected to a first electrode of the first switch, and a second end of the auxiliary power supply is connected to a second end of the battery pack; and   wherein the first electrode of the first switch is connected to the start unit, a second electrode of the first switch is separately connected to a first end of the battery pack and the start unit, a control electrode of the first switch is connected to the auxiliary power supply, and the first switch and the switch unit are coupled switches.   
     
     
         3 . The apparatus according to  claim 2 , wherein each of battery module of the plurality of battery modules further comprises a battery management unit (BMU); and
 wherein the BMU of each respective battery module is connected to the auxiliary power supply, and wherein the respective BMU is configured to detect an electrical signal of the auxiliary power supply, and in response to the electrical signal of the auxiliary power supply falling within a preset interval, control the auxiliary power supply to send a control signal to the first switch, wherein the control signal is associated with controlling the first switch to be turned on.   
     
     
         4 . The apparatus according to  claim 2 , wherein the start unit comprises a first button switch; and
 wherein the first button switch is connected in parallel to the first switch in at least one battery module of the plurality of battery modules.   
     
     
         5 . The apparatus according to  claim 2 , wherein the start unit comprises second button switches in a one-to-one correspondence with the plurality of battery modules; and
 wherein each second button switch of the second button switches is connected in parallel.   
     
     
         6 . The apparatus according to  claim 1 , wherein the switch unit comprises second switches in a one-to-one correspondence with the plurality of battery modules; and
 wherein each of the second switches is connected in series to a corresponding battery module of the plurality of battery modules.   
     
     
         7 . The apparatus according to  claim 6 , wherein each of the second switches is bridged between two adjacent battery modules of the plurality of battery modules. 
     
     
         8 . The apparatus according to  claim 6 , wherein a first electrode of each of the second switches is connected to a first end of the electrical energy output port, wherein a second electrode of each of the second switches is connected to a first end of the corresponding battery module, and wherein a second end of the corresponding battery module is connected to a second end of the electrical energy output port. 
     
     
         9 . The apparatus according to  claim 6 , wherein the switch unit further comprises third switches in a one-to-one correspondence with the second switches; and
 wherein a first electrode of each of the third switches is connected to a first electrode of a corresponding second switch of the second switches, and wherein a second electrode of each of the third switches is connected to a second end of a battery module connected to the corresponding second switch.   
     
     
         10 . The apparatus according to  claim 9 , wherein the switch unit further comprises first diodes in a one-to-one correspondence with the second switches and further comprises second diodes in a one-to-one correspondence with the third switches;
 wherein each first diode of the first diodes is connected in parallel to a corresponding second switch; and   wherein each second diode of the second diodes is connected in parallel to a corresponding third switch.   
     
     
         11 . A photovoltaic power generation system, comprising:
 a direct current-to-direct current (DC/DC) converter;   a direct current-to-alternating current (DC/AC) converter,   a controller, and   an energy storage apparatus comprising a plurality of battery modules, a switch unit, a start unit, and an electrical energy output port, each of the plurality of battery modules comprising a battery pack and an auxiliary power supply;   wherein each of the plurality of battery modules is separately connected to the start unit and separately directly connected to the switch unit, and wherein the plurality of battery modules are configured to, when the start unit receives a start signal, control the switch unit to be turned on;   wherein the switch unit is connected to the electrical energy output port;   wherein the energy storage apparatus is configured to, in response to the switch unit being turned on, output electrical energy stored in the plurality of battery modules through the electrical energy output port, and wherein the energy storage apparatus is configured to, in response to the switch unit being turned off, disconnect the plurality of battery modules from the electrical energy output port;   wherein a plurality of photovoltaic modules are connected to the DC/DC converter, and wherein each photovoltaic module of the plurality of photovoltaic modules is configured to convert optical energy into a first direct current, and to output the first direct current to the DC/DC converter;   wherein the DC/DC converter is separately connected to the DC/AC converter and the energy storage apparatus, and the DC/DC converter is configured to convert the first direct current into a second direct current, and to output the second direct current separately to the DC/AC converter and the energy storage apparatus;   wherein the energy storage apparatus is connected to the controller, and the energy storage apparatus is configured to supply power to the controller;   wherein the DC/AC converter is configured to convert the second direct current into a first alternating current, and to output the first alternating current; and   wherein the controller is separately connected to the DC/DC converter and the DC/AC converter, and wherein the controller is configured to control working statuses of the DC/DC converter and the DC/AC converter.   
     
     
         12 . The system according to  claim 11 , wherein the controller is further configured to control a working status of the energy storage apparatus. 
     
     
         13 . The system according to  claim 11 , wherein the photovoltaic power generation system further comprises an energy storage converter connected between the DC/DC converter and the energy storage apparatus. 
     
     
         14 . A control method, comprising:
 performing, by an energy storage apparatus connected to a controller and comprising a plurality of battery modules, each of the plurality of battery modules comprising a battery pack and an auxiliary power supply, a start unit connected to the plurality of battery modules, an electrical energy output port, and a switch unit separately directly connected to each of the plurality of battery modules and the electrical energy output port:
 controlling, by the plurality of battery modules, in response to determining that the start unit receives a start signal, the switch unit to be turned on; and 
 outputting, by the plurality of battery modules, stored electrical energy to the controller through the electrical energy output port. 
   
     
     
         15 . The method according to  claim 14 , wherein the switch unit comprises first switches in a one-to-one correspondence with the plurality of battery modules, and wherein each of the first switches is connected in series to a corresponding battery module; and
 wherein the controlling, by the plurality of battery modules, the switch unit to be turned on comprises:
 sending a first control signal to each of the first switches, wherein the first control signal controls the respective first switch to be turned on. 
   
     
     
         16 . The method according to  claim 15 , wherein the sending the first control signal to each of the first switches comprises:
 detecting an electrical signal on each battery module of the plurality of battery modules; and   sending, in response to determining that the electrical signal falls within a preset interval, the first control signal to each of the first switches.   
     
     
         17 . The method according to  claim 16 , wherein the electrical signal is an electrical signal of an auxiliary power unit. 
     
     
         18 . The method according to  claim 16 , wherein the switch unit further comprises second switches in a one-to-one correspondence with the first switches, wherein a first electrode of each of the second switches is connected to a first electrode of a corresponding first switch, and wherein a second electrode of each of the second switches is connected to a second end of a corresponding battery module connected to the corresponding first switch; and
 wherein the method further comprises:
 sending, in response to determining that an electrical signal on a target battery module of the plurality of battery modules falls outside the preset interval, a second control signal to a second switch connected to the target battery module, wherein the second control signal controls turning on and off the second switch connected to the target battery module. 
   
     
     
         19 . The method according to  claim 14 , wherein outputting the stored electrical energy to the controller through the electrical energy output port comprises outputting, by the plurality of battery modules, the stored electrical energy to the controller through the electrical energy output port in response to the switch unit being turned on. 
     
     
         20 . The method according to  claim 14 , further comprising disconnecting, in response to the switch unit being turned off, the plurality of battery modules from the electrical energy output port.